Musnad Ahmad 1017:28

Abu Mu'awiyah narrated to us, Al-A'mash narrated to us, from Ibn Buraydah, from his father. Abu Mu'awiyah said: And I do not think he heard it from him. He said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "No man brings out anything in charity until he loosens from it the jaws of seventy devils."